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Linux 2.6 - man page for if_nametoindex (linux section 3)

IF_NAMETOINDEX(3)					     Linux Programmer's Manual						 IF_NAMETOINDEX(3)

if_nametoindex, if_indextoname - mappings between network interface names and indexes
#include <net/if.h> unsigned int if_nametoindex(const char *ifname); char *if_indextoname(unsigned int ifindex, char *ifname);
The if_nametoindex() function returns the index of the network interface corresponding to the name ifname. The if_indextoname() function returns the name of the network interface corresponding to the interface index ifindex. The name is placed in the buffer pointed to by ifname. The buffer must allow for the storage of at least IF_NAMESIZE bytes.
On success, if_nametoindex() returns the index number of the network interface; on error, 0 is returned and errno is set appropriately. On success, if_indextoname() returns ifname; on error, NULL is returned and errno is set appropriately.
if_nametoindex() may fail and set errno if: ENODEV No interface found with given name. if_indextoname() may fail and set errno if: ENXIO No interface found for the index. if_nametoindex() and if_indextoname() may also fail for any of the errors specified for socket(2) or ioctl(2).
For an explanation of the terms used in this section, see attributes(7). +-----------------------------------+---------------+---------+ |Interface | Attribute | Value | +-----------------------------------+---------------+---------+ |if_nametoindex(), if_indextoname() | Thread safety | MT-Safe | +-----------------------------------+---------------+---------+
POSIX.1-2001, POSIX.1-2008, RFC 3493. This function first appeared in BSDi.
getifaddrs(3), if_nameindex(3), ifconfig(8)
2017-09-15 IF_NAMETOINDEX(3)

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